Oil-burning furnace.



K. M. DAHL.

OIL BURNING FURNACE.

APPLICATION FILED DEC. 15. 1913.

Patented July 2, 1918.

2 SHEETS-SHEET I.

WITNESSES ATTORNEYS INVENTOR O r f 1" 5, f H ,4 I.

K. M. DAHL.

OIL BURNING FURNACE.

APPLICATWN FILED DEC. [5. l9l3.

1 71,286. Patented July 2, 1918.

2 SHEETSSHEET 2.

WITNESSES J z d mvzufon ATTORNEYS KNU'I. MARTIN DAHL, 0! SAN FRANCISQO, CALIFORNIA.

OIL-BURNING renames.

Specification of letter: Patent.

Application filed December 15, 1918. Serial No. 808,788.

To all whom it may concern:

Be it known that I, KNUT MARTIN Dena, a citizen of the United States, residin in the city and county of San Francisco, tate of California, have invented a new and useful Oil-Burning Furnace, of which the following is a specification.

It is the purposeof the present invention to devise a novel furnace especially adapted for the burning of crude fuel oil and wherein provision is made to cause the temperature within the furnace to be raised to a sufiicient degree to prevent the forma: tion of carbon and the deposition of such carbon on the :walls of the furnace, and

' thereby increasing the efiiciency.

It further consists of a novel construction and arrangement of a trap for the hot gases whereby the temperature of the furnace is increased and a better combustion obtained.

It further consists of a novel construction and arrangement of a hanging bridge wall.

It further consists of other novel features of construction, all as will be hereinafter fully set forth.

For the purpose of illustrating the invention there has been shown herein different forms thereof which disclose the broad principles involved, although it is to be understoodthat the various instrumentalities of which the invention consists may be variously arranged and organized and that the invention is not limited to the exact arrangement and organization of these instru-- mentalities as herein set forth.

Figure 1 represents a sectional elevation of another embodiment of the invention, showing the same as employed in conjunction with a water tube boiler.

Fig. 2 represents a section on line g z Fig. 1, certain parts being omitted for the sake of clearness of illustration.

Similar numerals of reference indicate corresponding parts in the figures.

Referring to the drawings the hanging bridge wall is illustrated as applied to water tube boilers. 19 designates the outer wall or casing which is provided with the furnace front 20 through which pass the fuel feeding devices 21, the burner of which discharges through the passage 22 in the front wall 23, said passage 22 communicating wlth the burner chamber 24 on one side thereof and with the combustion chamber 25. 26 designates the lining of the furnace which extends along the bottom thereof in union with the vertical wall 27 from which latter extends the inclined brick wall 28 supported in any desired manner. 29 designates the hanging bridge wall embodying the inventron and which in the present instance drverges slightly upwardly from the inclined wall 28, and is provided at its lower portion with a desired number of apertures or passages 30therethrough. The tops of the apertures or passages 30 are covered by brlck arches 31. 32 designates a top wall whereby the products of combustion passing through the apertures 30 must pass first into the secondary combustion chamber 33 thence around the water tubes 34 and the baflie 35, thence around the baflie 36 and therefrom in the usual manner.

Since, the other parts of the furnace are well known to those skilled in this art, it has been deemed unnecessary to describe the same in detail. In the construction seen in Fig. 2, it has been deemed unnecessary to show in detail all of the tubes in section.

- A trap for the hot gases is provided by the bridge wall 29 so that such hot gases that by such construction and arrangement the temperature within the furnace 1s raised to a sufliciently high degree to prevent the formation of carbon on the walls thereof.

It is to be understood that the hanging bridge wall as herein disclosed may be employed in conjunction with an internally fired or other furnace and is especially adapted to furnaces for burning crude oil and furnaces with both the fire tube and water tube type of boilers.

It is also to be understood that the present invention may be employed in conjunction with any desired or conventional type of fuel feeding means.

h It will now be apparent that I have devised a novel and useful construction of an oil burning furnace which embodies the features of advantage enumerated as desirable in the statement of the invention and the above description, and while I have in the present instance, shown and described the preferred embodiments thereof. which have been found in practice to give satisfac- 'tory,and reliable results, it is to be understood that the same are susceptible of mod- Patented July 2, 1918. V

Having thus described my invention, what I claim as new and desire to secure by Letters Patent, is 1. In a furnace of the character described, a burner chamber adapted to receive a burner having a fuel inlet, a combustion' chamber, a wallbetween said burner chamher and combustion chamber having a passage therethrough for theadmission of hydrocarbon to said combustion chamber, a

depending bridge wall located at the rear of.

forming a secondary combustion chamber whose walls diverge upwardly, said rearwardly inclined wall serving to deflect the products of combustion upwardly.-

2. In a furnace ofthe character stated, a

ing a restricted passage in its lower portion, the upper portion of said bridge wall and arch serving to form a trap for the hot gases toprevent their direct passa e from the furnace, an inclined wall exten 'ng upwardly and rearwardly from'the bottom of saidbridge wall and forming a secondary combustion chamber located beyond said bridge wall and having upwardly diverging walls, an upwardly extending rear baflie extending above said bridge wall, and a front depending bafile in advance of said rear bafile and overlapping the first named baflie.

. KNUT MARTIN DAHL.

Witnesses:

FREopRIoK BIRDsALL,

MAURICE ASHER. 

